h2 {
    text-align: center;
    /*   text-transform: uppercase; */
    font-family: sans-serif;
}

.container {
    text-indent: 2em;
    width: 77%;
    margin: 4% auto;
    line-height: 1.5em;
    font-size: 16px;
    color: rgba(0, 0, 0, 0.73);
    background: #FDFDFD;
}

textarea {
    width: 100%;
    height: 29px;
    resize: none;
    outline: none;
    text-indent: 2em;
    border: none;
    border-bottom: 1px solid #9E9E9E;
    line-height: 1.8em;
    color: #9E9E9E
}

select {
    width: auto;
    outline: none;
    background: #FFFFFF;
    border: 1px solid #70BBF7;
    height: 31px;
    padding-top: 2px;
    margin-right: 35px;
}

input {
    background: none;
    border: 1px solid #80BEEF;
    padding: 5px 17px;
    font-size: 13px;
    margin-left: 32px;
}

.environment {
    margin: 10px 0px;
}

.return_link {
    opacity: .7;
    width: 48px;
    height: 48px;
    position: fixed;
    background: none;
    margin: 10% auto auto 5%;
    position: fixed;
}

.return_link::before {
    background: url("../pictures/bubble.png") no-repeat;
    background-position: 2px -2px;
    position: absolute;
    color: rgba(0, 0, 0, 1);
    padding: 10px;
    left: 100%;
    top: -100%;
    width: 53px;
    height: 48px;
    content: "返回";
    transition: all .6s;
    opacity: 0;
}

.return_link:hover::before {
    opacity: .8;
}

.return_link:hover {
    opacity: .5;
}

.return_home {
    opacity: .7;
    width: 48px;
    height: 48px;
    position: fixed;
    background: none;
    margin: 15% auto auto 5%;
}

.return_home::before {
    background: url("../pictures/bubble.png") no-repeat;
    background-position: 2px -2px;
    position: absolute;
    color: rgba(0, 0, 0, 1);
    padding: 10px;
    left: 100%;
    top: -100%;
    width: 53px;
    height: 48px;
    content: "主页";
    transition: all .6s;
    opacity: 0;
}

.return_home:hover::before {
    opacity: .8;
}

.return_home:hover {
    opacity: .5;
}
